rear end whine....help please
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rear end whine....help please
Guys, chasing a vibration issue here.....first off i did a sarch... i have a 2000 sd v-10 crew cab 4x4, 170,000 miles have had a vibration/whine for a while at highway speeds....60/75 mph have balanced tires as well as replaced u joints today, had to remove it to make sure they werent locked up, with miles on truck, i had them replaced to be on safe side. we had rear end up on jack and i ran it up to highway speed, checked wheel run out and it seemed okay.however when i got it up to about 70 i had a definite clunk from rear end.....the friend who ownes the shop(gear and powertrain/large truck drivetrain) tells me that its the rear bearings. carrier bearing(?) that i needed to fix them before they failed and took the ring gear with them. read here about several other folks with rear bearing issues and wanted to know if im heading in the right direction, or other possible trouble spots to check out thanks for any advice ideas.....
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Based on the testing you have already done, I would just change all the diff bearings and call it good. Before you tear it apart, drain the oil and check for metal, just to be sure. If the bearings are bad there will be enough metal to pick up some fuzz on a magnet.
But if you didn't hear the whine when you had it off the ground, It might well be your tires. I have made that mistake before... overhaul the differential only to find that the tires were noisy.
But if you didn't hear the whine when you had it off the ground, It might well be your tires. I have made that mistake before... overhaul the differential only to find that the tires were noisy.
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Yes. You have two carrier bearings and two pinion bearings inside the differential. The carrier bearings 'carry' the ring gear/spider gear assembly. The pinion bearings 'carry' the pinion gear, (which drives the ring gear.) The pinion gear has a shaft that comes out of the case and has a threaded end, and that's what the U-joint is attached to.
If one bearing fails, it starts shedding metal filings into the oil. That contamination will eventually get worse and take out the other bearings. So if you have one bad bearing, it's wise to change them all.
It is a job for a pro.
If one bearing fails, it starts shedding metal filings into the oil. That contamination will eventually get worse and take out the other bearings. So if you have one bad bearing, it's wise to change them all.
It is a job for a pro.
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From: Long Island USA
Check your hanger bearing FIRST - that's the bearing that the driveshaft hangs in.
A clunk from the rear with the wheels up, at 70MPH, you have a lot of speed/inertia, and any little slack in the axles or the differential gears will certainly make some noise. If you don't hear the clunk when driving at 70MPH and hit the gas and let off, I wouldn't immediately change out the bearings for that.
After you check the hanger bearing, and if it's good, do this, and answer the questions:
1) Get on the highway. While cruising at 70MPH, maintaining the same speed, do you hear the whine?
2) Let off and coast, do you hear the whine?
3) Get back on the go-pedal and accelerate, do you hear the whine?
The answers will help narrow down what is really going on.
A clunk from the rear with the wheels up, at 70MPH, you have a lot of speed/inertia, and any little slack in the axles or the differential gears will certainly make some noise. If you don't hear the clunk when driving at 70MPH and hit the gas and let off, I wouldn't immediately change out the bearings for that.
After you check the hanger bearing, and if it's good, do this, and answer the questions:
1) Get on the highway. While cruising at 70MPH, maintaining the same speed, do you hear the whine?
2) Let off and coast, do you hear the whine?
3) Get back on the go-pedal and accelerate, do you hear the whine?
The answers will help narrow down what is really going on.
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subscribing....
I can hear a whine when I let off and coast, it seems to go away when I'm not coasting....??
I can hear a whine when I let off and coast, it seems to go away when I'm not coasting....??
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FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
That could be the front pinion bearing in the rear differential, but then again, it could also be the hanger bearing (or so I've heard).
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FTE Leadership Emeritus
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From: Long Island USA
With the tranny in neutral, see if the input shaft of the rear end (pinion gear) is loose.
Still could be the hanger bearing though.
Postmaster
Joined: Nov 2006
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the pinion seal looks like its leaking slightly, not fresh oil kinda matted road residue oil. (If that makes sence)
I'll try to see if the input shaft is loose shortly.
Hanger bearing, is that the carrier bearing? Where the rear drive shafts are supported in the middle?
I'll try to see if the input shaft is loose shortly.
Hanger bearing, is that the carrier bearing? Where the rear drive shafts are supported in the middle?
Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
It could also be the ring and pinion whine if it were not set up exactly right.
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guys, krewat....the whine / slight roar is most prominent as i coast at speeds from 30-70+ the pitch changes as i get on the gas. the vibration i have been feeling seems to be gone since i had the u joints changed. i will know after this weekend when i go on the road where i feel it the worst..... i'm hoping its not rear end....my guy tells me we may be able to save ring and pinion if we get to it soon enough.....hey psd...no problem bout the hijack, my symtoms seem opposite from yours......Britt